If you are looking for something not to loud or emmisions safe i would say go with some headers, i personally like the bbk equal length shorties, and the magnaflow system witht eh catback and mufflers.
On the other hand, if you want a car with a sound that will stand out and sound mean and arent worried about emmisions heres what i did: I ordered the BBK EL shorties and 2 dual chamber Flows for my mufflers with the 2.5 offset in-out then I took the cat-back off and installed my headers and ran open headers to the exaust shop. Then i had them bend and run some 2.5 pipe dualed out str8 to the flows and dump it. Sounds extremely freat and gave me a nice power gain but if you get it done have them put in a X-pipe or H-pipe.
Not sure about the Magnaflow catback prices but i picked up the BBK headers- chrome finish- for $154.99 (ceramic is like $50 more) and the Flows were $54/each @ Tommy Vaughns Ford Racing in Houston. Check out
www.fordracing.com . The cost of the instal and pipe they used was like $160 so it was worth the money. If you plan on using the setup or antyhgin that i used then let me know and ill give you part #'s to look up on ford racing.
Bryan